Island



(No Model.)

G. H. WEBB. MACHINE FOR MILLING BOLTS.

No. 451,145. Patented Apr. 28, 1891.

WITN E5555] maven. w. c.

. UNITED STATES PATE T OFFICE.

GEORGE H. WEBB, OF PAWVTUCKET, RHODE ISLAND.

MACHINE FOR MILLINGBOLTS.

SPECIFICATION forming part of Letters Patent No. 451,145, dated April28, 1891.

Application filed Septemher26,1890. Serial No. 366,245. (Nomodel) To allwhom, it may concern:

Be it known that I, GEORGE H. WEBB, of the city of Pawtucket, in thecounty of Providence, in the State of Rhode Island, have invented acertain new and useful Improvement in Machines for Milling Bolts; and Ido declare the following to be a specification thereof, reference beinghad to the accompanying drawings.

Like letters indicate like parts.

Figure 1 is a side elevation of my improved bolt-milling machine. Fig. 2is a top plan of my said invention as seen on line was of Fig. 1, thebolt-holding device and the spring-actuated rod being shown in top planand the other parts in horizontal section on said line at at. Fig. 3 isan enlarged view of a portion of Fig. 2, except that the bolt is shownin the operation of being milled.

My invention relates to machines for milling bolt-shanks and bolt-heads.In finishing bolts it is desirable that that portion of the shank whichis between the head and the screw-thread should be cut into a smoothcylindrical form, and also that the under surface of the bolt-headshould be trimmed offsmooth and square. This operation is calledmilling.

My improved device has the same working parts as have been commonlyused'in such machines; but my invention consists of a hollow or tubularspindle and a spring-actuated rod movable longitudinally in said tubularspindle and adapted automatically to deliver the bolt from the machinewhen it has been properly milled.

In the drawings, A represents the bed of the machine, and B the legs. Acone-pulley 0 drives the milling mechanism.

D is the spindle mounted in the journals E and rotated by the pulley C.At its forward end it is circumferentially enlarged, as seen at a, toreceive a collet E, which is held in its bore bythe set-screw G.

The milling-tool H is held in the collet F by the set-screw I, and theouter end of the milling-tool is clamped by the clamping-collar J.

On the opposite end of the bed A a slide K, is longitudinally movable,being confined to one line of movement by the dovetail b. It

and it is moved back and forth by means of the bent lever M M, pivotedto the bed of the has a block L secured'to it by the screws 0,

machine at cl, and the link N; pivoted to the end of the bent arm Mofthe lever at e, and also to the block L at f. This lever is shown in thedrawings as a hand-lever; but it may be operated by power, if preferred.When the handle of this lever is depressed to the position indicated bydotted lines, the point f is advanced to the posit-ion f, and the slideis carried toward the milling mechanism to the position shown at z inFig. 1.- The slide K also has the block 0 secured to it by the screws m,and a holder P is fastened upon said block 0. From the holder Pa shaft Qextends, which has an enlarged end 0, and a bolt-holder R is screwedinto said end 0, as seen at-p. The bplt-holder R has a socket adapted toreceive the head of the bolt S.

As thus far described the machine is like those in common use for themilling of bolts.

The novel features which constitute my invention I will noW describe.

The spindle D is hollow or tubular throughout, and in it is placed a rodT, surrounded by a spiral spring U. This spring has its'forward bearingon a collar V, integral with the rod T, and its rear bearing against theinner surface of a perforated cap W, which screws over the rear end ofthe tubular spindle D. The rod T projects out beyond the cap W and has acollar g, by which its forward throw is limited, said collar qbeing adjustably securedto the rod T by a set-screw .2. If desired, the surfaceof said rod T may be formed to havea series of depressions to receivethe end of the set-screw, so as to more firmly secure the collar to therod. At its forward end the rodT terminates in the push-pin X. Thecollet F has a central bore to allow the push-pin to pass through it.

The operation of my device is asfollows: When the bolt S is advanced tothe millingtool in the direction indicated in Fig. 2 by the arrow, thepush-pin X projects into the aperture of the milling-tool, as seen inFig. 2. The end of the bolt S in entering pushes back the pin X, and thespring U yields to the pressure. The milling-tool cuts the shank andhead of the bolt in the usual manner, and continues so to do as long asthe bolt is kept in forcible contact therewith by the operative, Whopresses down on the lever-handle M for that purpose. lVhen the millinghas been satisfactorily done, the lever M is raised, thus with drawingthe bolt-h olding mechanism, and the bolt S is pushed out of themilling-tool by the action of the spring U, which is noW free to actautomatically, and the bolt drops to the floor.

Before my improvement Was made it was necessary to release the bolt fromthe machine by hand. By my device the release and delivery of the boltfrom the milling mechanism are accomplished automatically.

In the drawings I have shown the bolt S as having a square end. In casea bolt is to be milled which has a rounded or tapering point the end ofthe pin X may be centrally cupped or depressed to receive the end ofsuch bolt, thus centering it more accurately.

I claim as a novel and useful invention and desire to secure by LettersPatent- In a bolt-milling machine having means for holding and feedingthe bolt, a rotatable tubular spindle having 'a milling-tool connectedtherewith, in combination With a spring-actuated rod contained in saidtubular spindle and adapted automatically to deliver the bolt from themachine after the operation of milling, substantially as specified.

. GEORGE H. \VEBB.

Witnesses:

JAMES W. WILLIAMS, WARREN R. PERcE.

